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List:       reiserfs-devel
Subject:    Re: Re: reiserfs do_journal_end unnecessary hd wake up?
From:       "=?UTF-8?Q?Br=C3=A1ulio_Barros_de_Oliveira?=" <brauliobo () gmail ! com>
Date:       2008-09-04 23:47:54
Message-ID: 1df1788c0809041647n5f5e4d64yaa2f47d3302494fe () mail ! gmail ! com
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just found out! it is konsole, unbelievable! going to file a bug
report right now.
again, thank you very much for the support.
bráulio

On Thu, Sep 4, 2008 at 8:32 PM, Bráulio Barros de Oliveira
<brauliobo@gmail.com> wrote:
> but (as always there is), the situation is not good yet when using kde4.
> with it, i can't find out which process is accessing the hd, cause
> iotop only shows a pdflush access.
> i've tried to kill some apps, but it didn't help. any other trace technic?
> 
> regards,
> bráulio
> 
> On Thu, Sep 4, 2008 at 8:28 PM, Bráulio Barros de Oliveira
> <brauliobo@gmail.com> wrote:
> > hello mat, here comes the results of each action.
> > in all the process i've used the iotop (what a great utility you
> > pointed!), and always saw only the pdflush process acessing the hd. no
> > user interface were used.
> > the apm is set to 128 with hdparm
> > 
> > ok, then try the following:
> > 
> > you at least should have noatime,nodiratime,commit=600
> > 
> > > ) that did the job! also, i've tested without the commit option,
> > which didn't changed the result.
> > 
> > enabled for the reiserfs or >=ext3 filesystems
> > 
> > you can also try data=writeback (but beware this might put your data at risk !)
> > 
> > * can't try
> > 
> > select the anticipatory i/o scheduler
> > and set following stuff
> > 
> > > ( no change.
> > 
> > echo "16" > /proc/sys/vm/page-cluster
> > # default: 3
> > #
> > 
> > > ( no change.
> > 
> > echo "60" > /proc/sys/vm/swappiness
> > # default: 60
> > # By default, Linux will aggressively swap processes out of physical memory onto
> > disk in order to keep the disk cache as large as possible.
> > # This means that pages that haven't been used recently will be pushed into swap
> > long before the system even comes close to running out of memory, which is an
> > unexpected behavior compared to some operating systems.
> > # The /proc/sys/vm/swappiness parameter controls how aggressive Linux is in this
> > area.
> > 
> > > ( no change.
> > 
> > echo "3000" > /proc/sys/vm/dirty_expire_centisecs
> > # default: 3000 (30 seconds)
> > #2 how long data can be in the page cache before it is considered expired and
> > must be written at the next opportunity. Note that this default is very long: a
> > full 30 seconds. That means that under normal circumstances, unless you write
> > enough to trigger the other pdflush method, Linux won't actually commit anything
> > you write until 30 seconds later.
> > 
> > > ( no change.
> > 
> > echo "6000"  > /proc/sys/vm/dirty_writeback_centisecs
> > # default: 500 (5 seconds)
> > #1 how often pdflush wakes up to write data to disk. The default wakes up the
> > two (or more) active threads every five seconds.
> > # suggestion: 6000 (every 60 seconds)
> > 
> > > ( no change.
> > 
> > echo "15" > /proc/sys/vm/dirty_background_ratio
> > # default: 10
> > #3 Maximum percentage of active memory that can be filled with dirty pages
> > before pdflush begins to write them
> > 
> > echo "50"   > /proc/sys/vm/dirty_ratio #modified
> > # default: 40
> > #4 Maximum percentage of total memory that can be filled with dirty pages before
> > processes are forced to write dirty buffers themselves during their time slice
> > instead of being allowed to do more writes.
> > # modified: 50
> > 
> > echo "25" > /proc/sys/vm/vfs_cache_pressure
> > 
> > for i in /sys/block/sd*; do
> > /bin/echo "anticipatory" >  $i/queue/scheduler
> > done
> > 
> > for i in /sys/block/sd*; do
> > /bin/echo "0" >  $i/queue/iosched/antic_expire
> > done
> > 
> > for i in /sys/block/sd*; do
> > /bin/echo "150" >  $i/queue/iosched/read_expire
> > done
> > 
> > for i in /sys/block/sd*; do
> > /bin/echo "750" >  $i/queue/iosched/read_batch_expire
> > done
> > 
> > for i in /sys/block/sd*; do
> > /bin/echo "1200" >  $i/queue/iosched/write_batch_expire
> > done
> > 
> > for i in /sys/block/sd*; do
> > /bin/echo "1024" >  $i/queue/nr_requests
> > done
> > 
> > for i in /sys/block/sd*; do
> > /bin/echo "256" >  $i/queue/read_ahead_kb
> > done
> > 
> > for i in /sys/block/sd*; do
> > /bin/echo "256" >  $i/queue/max_sectors_kb
> > done
> > 
> > for i in /sys/class/scsi_host/host*; do
> > /bin/echo "min_power" >  $i/link_power_management_policy
> > done
> > 
> > 
> > 
> > 
> > try to disable each and every unneeded daemon or applets, programs, etc.
> > 
> > by using:
> > 
> > * powertop
> > * iotop
> > * htop
> > * top
> > * lsof | grep /home
> > * ...
> > 
> 
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